Magnetic Susceptibility in Strongly Coupled Systems
M. J. Luo
TL;DR
This paper investigates magnetic susceptibility in strongly coupled systems using AdS/CFT, revealing its universality and independence from temperature at large 't Hooft coupling, and compares it with weak coupling behavior.
Contribution
It provides a novel calculation of magnetic susceptibility at strong coupling within the AdS/CFT framework, highlighting its universal nature and temperature independence.
Findings
Magnetic susceptibility is universal and temperature-independent at strong coupling.
The susceptibility measured in bulk units is a universal constant.
Comparison with weak coupling shows distinct behaviors in magnetic response.
Abstract
We study the magnetic susceptibility at large 't Hooft coupling by computing the correlation function of the magnetizations in the strongly coupled Maxwell theory in large-N limit with finite temperature and chemical potential, within the framework of the AdS/CFT correspondence. We show that in strong coupling limit the magnetic susceptibility is independent to the temperature and be universal, measured in the unit of magnetic permeability of the bulk space. A comparison with the weak coupling system, the Pauli paramagnetic susceptibility, is also discussed.
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